pkg/front_end/testcases/regress/issue_33672.dart:7:34: Context: Write to a@260
  yield: for (int a = 0; a < 10; ++a) {
                                 ^^
pkg/front_end/testcases/regress/issue_33672.dart:8:29: Context: Write to b@295
    for (int b = 0; b < 10; ++b) {
                            ^^
pkg/front_end/testcases/regress/issue_33672.dart:9:7: Context: Write to count@231
      ++count;
      ^^
pkg/front_end/testcases/regress/issue_33672.dart:12:5: Context: Write to count@231
    ++count;
    ^^